Spot-tailed Antwren

The spot-tailed antwren is 9.5 to 10.5 cm (3.7 to 4.1 in) long and weighs 8 to 9 g (0.28 to 0.32 oz). Adult males have a black crown and nape, a long pale gray to white supercilium, a black streak through the eye, and pale grayish ear coverts. Their back and rump are dark gray with black patches, white-edged black scapulars, and a white patch between the scapulars. Their wings are black with white tips on the coverts and white edges on the flight feathers. Their tail is black with white tips and a long white streak on the central feathers. Their throat and underparts are pale gray with a white center to the belly. Adult females have a black crown with rufous-cinnamon streaks, buffy edges on the flight feathers, and paler, buff-tinged, underparts than males.

The spot-tailed antwren is found from eastern Venezuela's Bolívar state east through the Guianas into northeastern Brazil's Amapá state. It inhabits the mid-level to the canopy of humid evergreen forest. It favors areas near water such as gallery forest and seasonally flooded forest and within them frequents vine tangles.

The spot-tailed antwren's diet has not been detailed but is known to be mostly arthropods. It forages singly, in pairs, and in family groups, and often as a member of a mixed-species feeding flock. It typically feeds between 15 and 30 m (50 and 100 ft) above the ground. It forages actively and usually captures prey by gleaning leaves, stems, and vines by reaching from a perch. It is not known to follow army ants.